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Two Awesome Domain WHOIS History Search Tools to Look Up the History of Domain Names. Cybersecurity analysts and law enforcement agencies often employ WHOIS data, among other sources, to build threat actor profiles. With the help of WHOIS information, finding out who owns domains can provide invaluable clues for advancing investigations and sometimes even up to case resolution. In 2018, ICANN issued a policy that mandates registrars to comply with the General Data Protection Regulation (GDPR) That allowed domain registrants, particularly those from the EU, to anonymize their WHOIS.